DIN EN 61753-2-1:2001 光纤互连装置和无源部件性能标准.第2-1部分:端接于U级单模纤维的光纤连接器.非受控环境
Fibre optic interconnecting devices and passive components performance standard - Part 2-1: Fibre optic connectors terminated on single-mode fibre for category U; Uncontrolled environment (IEC 61753-2-1:2000); German version EN 61753-2-2-1:2000